linux-kernel - Re: [PATCH] drm/amdgpu: Fix memory leak in hpd_rx_irq_create

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Date:   Tue, 13 Sep 2022 08:54:02 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Rafael Mendonca <rafaelmendsr@...il.com>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <Wayne.Lin@....com>,
        Mikita Lipski <mikita.lipski@....com>,
        Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu: Fix memory leak in hpd_rx_irq_create_workqueue()

Applied.  Thanks!

On Mon, Sep 12, 2022 at 10:12 PM Rafael Mendonca <rafaelmendsr@...il.com> wrote:
>
> If construction of the array of work queues to handle hpd_rx_irq offload
> work fails, we need to unwind. Destroy all the created workqueues and
> the allocated memory for the hpd_rx_irq_offload_work_queue struct array.
>
> Fixes: 8e794421bc98 ("drm/amd/display: Fork thread to offload work of hpd_rx_irq")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 5140d9c2bf3b..6a2e455c5466 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1295,13 +1295,21 @@ static struct hpd_rx_irq_offload_work_queue *hpd_rx_irq_create_workqueue(struct
>
>                 if (hpd_rx_offload_wq[i].wq == NULL) {
>                         DRM_ERROR("create amdgpu_dm_hpd_rx_offload_wq fail!");
> -                       return NULL;
> +                       goto out_err;
>                 }
>
>                 spin_lock_init(&hpd_rx_offload_wq[i].offload_lock);
>         }
>
>         return hpd_rx_offload_wq;
> +
> +out_err:
> +       for (i = 0; i < max_caps; i++) {
> +               if (hpd_rx_offload_wq[i].wq)
> +                       destroy_workqueue(hpd_rx_offload_wq[i].wq);
> +       }
> +       kfree(hpd_rx_offload_wq);
> +       return NULL;
>  }
>
>  struct amdgpu_stutter_quirk {
> --
> 2.34.1
>